Just want to share to all about ESXi5.0 Update1 released on March 2012
What's New?
New processor support.
Additional Operating System support like Mac OS X Server Lion 10.7.2 and 10.7.3.
New Device Drivers
45+ issue occured on ESXi 5.0 has been resolved with release of ESXI5.0 Update 1.
Refer release notes for more information at below link
http://www.vmware.com/support/vsphere5/doc/vsp_esxi50_u1_rel_notes.html